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Ferri-kaersutite

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Formula:
NaCa
 
2
(Mg
 
3
Fe
3+
 
Ti)(Al
 
2
Si
 
6
O
 
22
)O
 
2
The Kaersutite group minerals are WO2- dominant amphiboles defined with :
A(Na+K+2Ca)> 0.5 apfu,
B: Ca dominant
CTi > 0.5 apfu and
WO > 1.0 apfu


Ferri-kaersutite is defined with
A position: Na dominant
C2+ position: Mg dominant
C3+ position: Fe dominant
System:Monoclinic
Member of:Kaersutite Group > w(O)-dominant Amphibole Group > Amphibole Supergroup
This page provides mineralogical data about Ferri-kaersutite.

Classification of Ferri-kaersutite

IMA status:Approved 2011
mindat.org URL:http://www.mindat.org/min-42829.html
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Type Occurrence of Ferri-kaersutite

Type Locality:Deeti volcanic cone, Gregory Rift, Rift Valley Province, Kenya
Place of Conservation of Type Material:Mineralogical Museum, Department of Mineralogy, St Petersburg State University, St Petersburg, Russia, catalogue number 1/19465

Crystallography of Ferri-kaersutite

Crystal System:Monoclinic
Class (H-M):2/m - Prismatic
Space Group:B2/m {B1 1 2/m} {C2/m} {C1 2/m 1}
Cell Parameters:a = 9.8837(3) Å, b = 18.0662(6) Å, c = 5.3107(2) Å
β = 105.278(1)°
Ratio:a:b:c = 0.547 : 1 : 0.294
Unit Cell Volume:V 914.77 ų (Calculated from Unit Cell)
X-Ray Powder Diffraction:
d-spacingIntensity
3.383(62)
3.281(30)
2.708(97)
2.596(75)
2.555(100)
2.162(36)
1.585(39)
1.521(48)

Chemical Properties of Ferri-kaersutite

Formula:
NaCa
 
2
(Mg
 
3
Fe
3+
 
Ti)(Al
 
2
Si
 
6
O
 
22
)O
 
2


The Kaersutite group minerals are WO2- dominant amphiboles defined with :
A(Na+K+2Ca)> 0.5 apfu,
B: Ca dominant
CTi > 0.5 apfu and
WO > 1.0 apfu


Ferri-kaersutite is defined with
A position: Na dominant
C2+ position: Mg dominant
C3+ position: Fe dominant
Simplified for copy/paste:NaCa2(Mg3Fe3+Ti)(Al2Si6O22)O2
Essential elements:Al, Ca, Fe, Mg, Na, O, Si, Ti
All elements listed in formula:Al, Ca, Fe, Mg, Na, O, Si, Ti

Relationship of Ferri-kaersutite to other Species

Member of:Kaersutite Group > w(O)-dominant Amphibole Group > Amphibole Supergroup
Other Members of Group:

- +
Ferro-kaersutite
{Na}{Ca
 
2
}{Fe
2+
3
AlTi}(Al
 
2
Si
 
6
O
 
22
)O
 
2
Kaersutite
{Na}{Ca
 
2
}{Mg
 
3
AlTi}(Al
 
2
Si
 
6
O
 
22
)O
 
2

Other Names for Ferri-kaersutite

Synonyms:
IMA2011-035
Other Languages:

Other Information

Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Ferri-kaersutite

Reference List:

- +
Zaitsev, A.N., Avdontseva, E.Y.,Britvin, S.N., Deme´ny, A., Homonnay, Z., Jeffries, T., Keller, J., Krivovichev, V.G., Markl, G., Platonova, N.V., Siidra, O.I. and Spratt, J. (2011): Ferrikaersutite, IMA 2011-035.CNMNC Newsletter No. 10, October 2011, page 2556

Frank C. Hawthorne, Roberta Oberti, George E. Harlow, Walter V. Maresch, Robert F. Martin, John C. Schumacer, Mark D. Welch (2012): Nomenclature of the amphibole supergroup, American Mineralogist, Volume 97, pages 2031–2048

Internet Links for Ferri-kaersutite

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  • Localities for Ferri-kaersutite

    The map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Germany
     
    • Rhineland-Palatinate
      • Eifel
        • Mendig
          • Bell
    Nikita Chukanov exchange list
    Kenya
     
    • Rift Valley Province
      • Gregory Rift
    Zaitsev, A.N., Avdontseva, E.Y.,Britvin, S.N., Deme´ny, A., Homonnay, Z., Jeffries, T., Keller, J., Krivovichev, V.G., Markl, G., Platonova, N.V., Siidra, O.I. and Spratt, J. (2011): Ferrikaersutite, IMA 2011-035.CNMNC Newsletter No. 10, October 2011, page 2556
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